Ever since upgrading to Jaunty I've been hating the fact that I made the switch. Early on I had overall video performance problems but shortly after the initial release of Jaunty an update fixed those.

Yet still I had horrible full-screen video performance from Macromedia Flash - especially on sites like Hulu.

Well today I found the solution. It seems that the power-saving "ondemand" features in Jaunty was never coming out of power save mode to handle the increased CPU usage of full screen Flash video. Simply adding the "CPU Frequency Scaling Monitor" to the taskbar and setting the CPU to "Performance" - or manually setting it at a higher speed - solved the issue.